Geminus est un cratère de 86 Km et profond de 5400 m situé près du limbe Nord-est de la Lune. Le cratère apparaît en raison de sa position de forme ovale mais il est réellement presque circulaire dans la forme. La muraille circulaire de Geminus contient un certain nombre d'entailles extérieures, en particulier au nord et à l'est. L'éjecta du cratère est encore évident. Le mur intérieur est en terrasse. Il n'y a aucun impact notable sur le plancher intérieur, mais il y a une longue arête centrale située au point médian.

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Geminus is a lunar impact crater that is located near the northeast limb of the visible Moon. In this position the crater appears oval in shape due to foreshortening, but it is actually more nearly circular in form. Notable nearby craters include Messala to the northeast, Bernoulli due east, and Burckhardt and Cleomedes to the south.

The circular rim of Geminus contain a number of outward notches, particularly to the north and east. The crater ejecta is still visible in the rough surroundings beyond the rim, but any rays deposited during the impact have long since been worn away by space weathering. The inner wall is wide and extensively terraced, although these features are now somewhat muted due to impact erosion. There are no notable impacts on the interior floor, but there is a long, slender central ridge located at the mid-point.